"Spank" is a verb, not a noun. Therefore, it is impossible for you to have a spank under your porch, as such a thing does not exist. And if it is impossible for you to have a spank under your porch, then it is also impossible to get a spank out from under your porch.

Perhaps you meant "skank". It is quite possible to have a skank under your porch. Please send Shane (Blind Drunk in Blind River) a PM. He is an expert on skanks.